Ovulation Test on Period Day 5

Alexa

So, out of curiosity, I took an ovulation test today and it is day 5 of my period so I’m having next to no bleeding at all. I got my period 2-3 days early and it was normal bleeding the first two days and then it was just brown dried blood the last 3. I took this ovulation test today and clearly it’s positive. Is it normal to be fertile already/ovulating this early? What else could this mean?